請教一下為什么我doPost 和 doGet 方法都寫了 卻顯示 "此URL不支持Http方法POST"。

package servlet;

import Tools.DBUtils;
import com.Student;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.sql.SQLException;
import java.util.List;

public class XiuGaiServlet extends HttpServlet {
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        req.setCharacterEncoding("utf-8");
        Student stu = new Student();
        stu.setMingzi(req.getParameter("mingzi"));
        stu.setDizhi(req.getParameter("dizhi"));
        stu.setYuwen(req.getParameter("yuwen"));
        stu.setShuxue(req.getParameter("shuxue"));
        stu.setYingyu(req.getParameter("yingyu"));
        try {
            boolean ok = new DBUtils().xiugai(stu);
            if (ok){
                resp.sendRedirect("sousuo");
            }
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }
    }

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        req.setCharacterEncoding("utf-8");
        String id = req.getParameter("Id");
        try {
            List<Student> list = new DBUtils().sousuoId(id);
            if (list != null){
                req.setAttribute("xinxi",list);
                req.getRequestDispatcher("xiugai.jsp").forward(req,resp);
            }else{
                req.setAttribute("cuowu","no");
                resp.setContentType("text/html;charset=utf-8");
                req.getRequestDispatcher("sousuo.jsp").forward(req,resp);
            }
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }
    }
}





//表單如下
  <form action="xiuGai" method="post">
        <table border="1px" align="center" >
            <tr >
                <td>ID</td>
                <td><input type="text" value="https://bbs.csdn.net/topics/${xinxi.get(0).getID()}" name="Id" readonly></td>
            </tr>
            <tr >
                <td>姓名</td>
                <td><input type="text" value="https://bbs.csdn.net/topics/${xinxi.get(0).getMingzi()}" name="mingzi"></td>
            </tr>
            <tr>
                <td>地址</td>
                <td><input type="text" value="https://bbs.csdn.net/topics/${xinxi.get(0).getDizhi()}" name="dizhi"></td>
            </tr>
            <tr>
                <td>語文</td>
                <td><input type="text" value="https://bbs.csdn.net/topics/${xinxi.get(0).getYuwen()}" name="yuwen"></td>
            </tr>
            <tr>
                <td>數學</td>
                <td><input type="text" value="https://bbs.csdn.net/topics/${xinxi.get(0).getShuxue()}" name="shuxue"></td>
            </tr>
            <tr>
                <td>英語</td>
                <td><input type="text" value="https://bbs.csdn.net/topics/${xinxi.get(0).getYingyu()}" name="yingyu"></td>
            </tr>
            <input type="submit">
        </table>
    </form>

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